Method for constructing cylindrical structures such as steel chimneys

ABSTRACT

Constructing cylindrical structures such as tall steel chimneys, advertisement towers and antenna supports by separately preparing a cylinder with a closed upper end, which will become the top end section of the intended cylindrical structure, and a plurality of extension cylinders to be successively connected thereto, fitting said closed-end cylinder to a fixed guide in telescopic relation, supplying compressed gas into an inside air-tight space surrounded by said cylinder and guide to lift the closed-end cylinder, connecting one of the extension cylinders to the lower end of the lifted cylinder and lifting the extended cylindrical structure by again utilizing compressed gas. These procedures are repeated whereby a cylindrical structure of desired height can be safely constructed.

Oct. 3, 1972 United States Patent Ashida 4/1970 OHanlon...................

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Att0rneyFarley, Forster and Farley [72] Inventor: Hiroshi Ashida, Nishinomiya, Japan [73] Assignee:

[ ABSTRACT Constructing cylindrical structures such as tall steel Hitachi Shipbuilding and Engineering Co., Ltd.

[22] Filed; April 9 1970 chimneys, advertisement towers and antenna supports by separately preparing a cylinder with a closed upper [21] Appl. No.: 26,835

end, which will become the top end section of the intended cylindrical structure, and a plurality of extension cylinders to be successively connected thereto, [30] Forelgn Appl'cauon Pnomy Dam fitting said closed-end cylinder to a fixed guide in tele- June ll, 1969 Japan 397 scopic relation,supplyingcompressed gas into an inside air-tight space surrounded by said cylinder and dures are repeated whereby a cylindrical structure of desired height can be safely constructed.

guide to lift the closed-end cylinder, connecting one of the extension cylinders to the lower end of the lifted cylinder and lifting the extended cylindrical structure by again utilizing compressed gas. These proce l0 1 2m 2 7 M 9 %9 2 2 l o 2 4 /9 90 20 MW m m I4 m 1 mu n ""9 "m2 mmm L m C d U-l-F 11]] 2 00 555 [[l.

8 Claims, 24 Drawing Figures [56] References Cited UNITED STATES PATENTS 2,554,768 5/1951 Allen...........................29/43l PATENTinucIa m2 SHEET 1 OF 8 mm 1 m .w w/ [W 0 4 R... m M r v PATENTEDUBT3 Ian 3.694.893 SHEET 2 UF 8 PATENTEDnm 3 m2 Fig sum u m8 Fig IO 39 35 35 [Ill 38 IN VEN TOR.

PATENTEDncrs I972 3.694.893 sum 5 or 3 Fig l3 32 11v VENTOR. 5112mm 05/1/19 0 METHOD FOR CONSTRUCTING CYLINDRICAL STRUCTURES SUCH AS STEEL CHIMNEYS BACKGROUND OF THE INVENTION The conventional method of constructing a tall steel chimney for thermal power plants involves preparing in advance a number of cylindrical structures of given length, or elements of given length in the form of circumferential segments of such cylindrical structures,

- on the upper end of the chimney column. Due to this inconvenient working environment it is difficult to increase the number of workers who connect the parts and the construction entails relatively large cost. Moreover, the period of time needed for construction is very long and there is constant danger so that also many problems arise from a safety aspect.

In order to overcome these problems another method of construction has been proposed. This method comprises telescopically arranging cylindrical sections constituting a chimney, installing them in a collapsed state, and temporarily closing the upper end of the cylinder that will become the top end section of the chimney. Compressed gas is supplied into the interior and the gas pressure causes the cylinders to be lifted one after another to increase the length of the column. Adjacent cylinders are endwise connected, thereby providing a chimney of desired height.

In this method, however, it is expected that'there will be new drawbacks in that after completion of the construction of a chimney, stepped regions are created as a result of the differences in the diameters of the cylinders and it is most difficult to telescopically arrange the adjacent cylinders with a minimum of clearance.

With these points in mind, the present invention provides a method of constructing cylindrical structures by improving the method utilizing compressed gas.

SUMMARY OF THE INVENTION According to the present invention, there are used a cylinder of given length with a closed upper end, which will become the top end section of an intended cylindrical structure, a plurality of extension cylinders which are to be successively connected to said closed-end cylinder and a fixed guide serving both to guide these cylinders when they are lifted by compressed gas and to define an air-tight space which is surrounded by the cylinders and into which the compressed gas is supplied.

The method comprises the steps of fixedly installing the guide on the construction site, fitting the closedend cylinder to the fixed guide in telescopic relation, supplying compressed gas into an air-tight inside space surrounded by the cylinder and guide thereby lifting said closed-end cylinder a' given distance, connecting one of the extension cylinders to the lower end of the lifted cylinder, and supplying compressed gas into the now extended but still air-tight inside space to lift the closed-ed cylinder along with the extension cylinder connected thereto a given distance. These procedures are repeated until a cylindrical structure of desired height is constructed.

The construction of cylindrical structures such as steel chimneys by using the present method described above allows a great reduction in the cost of temporary construction facilities. Further, since there is no need to lift chimney parts with a'crane and the connecting operation for parts can be carried out at a place near the ground, the working environment is relatively convenient and the work can be done more safely. Since the working environment is very good as described above, many workers can be mobilized and connecting I work of good quality can be performed. As a result,

reductions in the construction period and in the cost may be expected.

A comparison between the previously described telescopic system and the present method will show that according to the present invention the difficult work of telescopically mounting cylinders of large diameter is not necessary and since an extension cylinder is connected to the lower end of the lifted cylinder, it is also possible to use cylinders of the same diameter to construct a straight tube-like cylindrical structure. This would be impossible to attain with the telescopic system.

Other numerous features and merits will be understood from the following description of embodiments of the invention given with reference to the accompanying drawings.

DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevation illustrating parts of cylinders on a base;

FIG. 2 is a plan view of the parts shown in FIG. 1;

FIG. 3 is a schematic sectional elevation illustrating a cylinder with a closed upper end placed over the parts of FIG. 1;

FIG. 4 is an enlarged sectional elevation showing a steel tower, and a cylindrical guide surrounding the closed-end cylinder;

FIG. 5 is a sectional plan view of the parts shown in FIG. 4 other than the steel tower;

FIG. 6 is a schematic sectional elevation similar to FIG. 4 showing the closed-end cylinder extended;

FIG. 7 is a view similar to FIG. 6 showing an extension cylinder connected to the closed-end cylinder;

FIG. 8 is a view similar to FIG. 7 showing a further extension of the structure;

FIG. 9 is an elevation of a completed chimney;

FIG. 10 is a schematic sectional elevation illustrating an alternate method with a closed-end cylinder surrounding a cylindrical guide;

FIG. 11 is an enlarged sectional plan view showing the base portion of the cylindrical guide of FIG. 10;

FIG. 12 is a schematic sectional elevation similar to FIG. 10 with the closed-end cylinder extended;

FIG. 13 is a schematic elevation similar to FIG. 12 showing an extension cylinder placed on the base;

FIG. 14 is a schematic plan view illustrating the erection of the extension cylinder shown in FIG. 13;

FIG. 15 is a view similar to FIG. 13 showing the structure with the extension cylinder in raised position;

FIG. 16 is a schematic elevation showing a modified form of guide structure for use with the method of FIGS. -15;

FIG. 17 is a schematic elevation illustrating the construction of multiple chimneys;

FIG. 18 is a view similar to FIG. 17 showing a further stage in the construction;

FIG. 19 is a view similar to FIG. 18 showing the construction nearing completion;

structure extended; and,

FIG. 24 is an enlarged sectional detail illustrating a further form of sealing means.

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment In this embodiment, a cylindrical body is used as a fixed guide, into which is fitted another cylinder which will be lifted by compressed air.

FIG. 1 shows parts 1 for constructing extension cylinders erected on a base 2. The parts 1 are of arcuate cross-section, such as would result if an extension cylinder 3 of given length were circumferentially divided, as shown in FIG. 2. These parts are stacked in the illustrated manner.

FIG. 3 shows a cylinder 6 closed at its upper end S and placed on the base 2 to surround a group 4 of the parts 1. The cylinder 6 is the one which will become the top end section of the cylindrical structure to be constructed, and has the same diameter as the extension cylinders 3 to be fabricated of the parts I.

Then, as shown in FIG. 4, a cylindrical guide 7 is externally fitted to the cylinder 6 and has its lower end 8 secured on a base 9 in an air-tight state.

The cylindrical guide 7 is slightly shorter than the cylinder 6 disposed therein and defines a clearance 12 between it and the cylinder 6, the size of the clearance being such that it will not hinder the cylindrical body 6 from being vertically lifted. Near the lower end of the guide a workers doorway 11 is provided having an airtight closable door 10, and around the upper end sealing means 13 is provided to make the clearance 12 airtight with respect to the outside.

The numeral 14 designates a steel tower for supporting the cylindrical structure to be constructed. The steel tower is erected on the base 9 and its height increases progressively as successive extensions are added to the cylindrical structure. A ring 15 secured to the steel tower l4 guides the cylindrical structure when the latter is Iified by compressed air.

Compressed air is supplied by an air compressor 16 into the space inside the cylinder 6 to lift the cylinder 6. Thus, the cylinder 6, which is being lified under air pressure, moves upwardly while being guided by the guide ring 15 as shown in FIG. 6. When the lower end 17 of the cylinder 6 becomes substantially flush with the upper end of the parts group 4, the supply of com pressed air is interruped.

An extension cylinder formed by utilizing parts 1 in the inside space will be connected to the lower end 17 of the cylinder 6 which has been lifted, and the retention of the cylinder 6 during such connecting operation may be effected by various methods.

For example, the pressure in the inside space surrounded by the cylinder 6 and the cylindrical guide 7 may be maintained at a suitable value so that the cylinder 6 may be held in its lifled position. Alternatively, as shown in FIG. 6, hanger pieces 18 may be temporarily fixed at suitable places on the outer surface of the cylinder 6, and by utilizing wires 19 and the hanger pieces 18, the cylinder 6 is suspended from the steel tower 14. In some cases, these two methods may be combined.

In cases where the retention of the cylindrical body is efiected by maintaining the pressure in the inside space surrounded with the cylindrical body 6 and cylindrical guide 7, it must be considered whether or not it is possible for a worker to enter the inside space to carry out his operations including connecting an extension cylinder to the cylinder 6.

Assuming a steel chimney which is m. in height and 6m. in diameter is to be constructed, and the total weight of this steel chimney is about 200 metric tons, then the air pressure needed for supporting the chimney column may be expressed by the following formula:

where P the air pressure needed for establishing balance with the column weight (Kg/cm), 11' the circular constant, r the radius of the column (cm), and W= the weight of the column (Kg). Thus, in order to support this chimney, air pressure which is 0.7l/kg/cm greater than atmospheric pressure may be used, anii as long as this order of pressure is acting in the inside space, operations can be carried out without hindrance.

The worders within the cylindrical guide 7 arrange parts 1 cylindrically around the lower end 17 of the cylinder 6 and weld the upper ends of said parts 1 to the lower end 17 of the cylinder 6 and also weld these parts in a cylindrical form to provide an extension cylinder 20 connected to the cylinder 6, as shown in FIG. 7.

It is to be noted that when the positioning of the cylinder 6 is effected by the wires 19, the workers can enter and leave the inside space by the doorway 11 without the need for an air lock.

Thereafter, compressed air is supplied again into the inside space surrounded by the cylinder 6 and the extension cylinder 20 to lift these two cylindrical bodies. This operation is preceded by the addition of an extension to the steel tower l4 and the provision of another guide ring 15.

FIG. 8 shows a condition in which the two cylinders 6, 20 have been lifted a given distance from the condition shown in FIG. 7, with the lower end 21 of the cylinder 20 being substantially flush with the upper end of the parts group 4 in the inside space. Thereafter, as already described, the formation of an extension cylinder of parts 1, the addition of an extension to the steel tower l4 and the provision of another guide ring 15 are carried out, followed by the supplying of compressed air to again lift the extended cylindrical structure.

FIG. 9 shows a straight tube-like cylindrical structure 22 constructed by repeating the procedures described above, which structure may be used as a chimney after the upper end 5 of the uppermost cylinder 6 is cut off.

The cylindrical guide 7 is utilized in its entirety as thelowennost section of the column, but a cylindrical'section of the same diameter as the straight cylindrical structure 22 may be used in place of the cylindrical guide 7. In cases where the structure is not used as a chimney, the upper end 5 of the top end section 6 may be left closed;

According to this first embodiment, certain advantages are obtained. Since the cylindrical guide for upward movement of the cylindrical sections is disposed outside the latter, the upward movement can be stably efi'ected, and the cylindrical guide can be readily used in its entirety as the lowermost section of the cylindrical structure.

Second Embodiment In this second embodiment, a cylinder to be lifted by compressed air is externally fitted to a fixed cylinder. Thus, as shown in FIG. 10, a cylindrical guide 30 is airtightly installed vertically on a base 31 and a cylinder 33 closed at its upper end 32 is externally fitted to said cylindrical guide 30. Interposed between the upper end of the cylindrical guide 30 and the inner surface of the cylinder 33 is a sealing means 35 for making air tight the inside space 34 of the cylindrical guide 30 and the cylinder 33. A two piece split support block 36 supports the lower end 37 of the cylinder 33, and a supporting steel tower 38 and a guide ring 39 are provided.

An air supply tube 41 from an air compressor 40 is led into the cylindrical guide 30 through the cutaway portion of the support block and compressed air is supplied into the inside space 34 to lift the cylinder 33 as shown in FIG. 12. A valve 44 is installed in the air supply tube 41.

Temporary retention of the cylinder 33 can be effected by a suitable method such as described for the first embodiment.

Thereafter, as shown in FIG. 13, an extension cylinder 42 is connected to the lower end 37 of the lifted cylinder 33. As shown in FIG. 14, it is possible to obtain an extension cylinder 42 which can be externally fitted to the cylindrical guide 30 and coaxially connected to the lower end of the cylinder 33, by bringing semi-circular parts 43 toward each other on both sides of the cylindrical guide 30 and joining them together.

After completion of the connection of the extension cylinder 42, it is possible to lift both cylinders 33 and 42, as shown in FIG. 15, by supplying compressed air into the extended inside space 34' (see FIG. 13). In this case, the augmentation of the steel tower 38 and the provision of an additional guide ring 39 are carried out in advance as in the case of the first embodiment. Thereafter, by repeating the same procedures as described above, a cylindrical structure of desired height can be obtained.

According to the second embodiment, even in cases where temporary retention of the lifted cylinders is effected by air pressure, the work of connecting extension cylinders need not be donein a chamber having a pressure higher than atmospheric pressure, and the working space is not as confined as in the case of the first embodiment. The working environment is therefore improved in comparison with the first embodiment.

Third Embodiment Basically, this embodiment is the same as the second embodiment except that, as shown in FIG. 16, a fixed guide is made in the form of a shallow saucer and is supported at the required level by a supporting steel tower 51. Sealing means 52, an air compressor 53, and an air supply tube 54 are used in the same manner as in the second embodiment. A two-piece split support block 55 provides a cutaway portion through which the air supply tube 54 is laid, and valve 56 is placed in the air supply tube 54.

In cases where the guide 50 is utilized, the method of construction is no different from that of the second embodiment; it comprises lifting by compressed air a cylinder 57 closed at its upper end, and then connecting an extension cylinder to the lower end of the cylinder 57.

Fourth Embodiment This embodiment relates to the application of the present method for the construction of multiple adjacent structures.

As shown in FIGS. 17 through 19, a crane 62 is installed on the top end section 61 of a cylindrical structure constructed by the present method already described in the preceding embodiments, and by utilizing said crane 62, other adjacent cylindrical structures 63 and 64 are constructed. The cylindrical structure 60, on which the crane 62 is installed, is constructed in advance of the cylindrical structures 63 and 64. As shown in FIG. 17, the cylindrical structure 60 is always taller by a predetermined amount that the other cylindrical structures 63 and 64, and the crane 62 is utilized to hoist material to increase the height of the juxtaposed cylindrical structures 63 and 64.

By utilizing the crane to hoist parts, it is also possible to increase the height of a steel tower support 65. Again shown are an air compressor 66 and an air supply tube 67 for the construction of the cylindrical structure.

FIG. 19 shows multiple chimneys constructed by repeating the procedures described above. In the last stage of construction, the crane 62 is removed and the cylindrical structure constructed by the present method (the chimney 60) is opened at the top. If necessary, the top end section 61 may be removed so that the chimney 60 has the same height as the other chimneys 63 and 64. Thus, the cylindrical structure constructed by the present method forms a part of the multiple chimney and is applied to the construction of the other parts.

Several examples will now be described of means for making air-tight an inside space surrounded by the cylinders.

FIRST EXAMPLE This example utilizes liquid sealing means as shown in FIGS. 20 and 21. Defined between a cylindrical guide 71 air-tightly fixed at its lower end to a base and a closed-end cylinder 72 internally fitted thereto is a cylindrical clearance 73 which is to be sealed and which decreases in size as the cylinder 72 moves upwardly. The clearance 73 is enclosed by an annular flange 74 extending from the upper end of the cylindrical guide 71 to lie in close proximity to the outer surface of the cylinder 72, and by a removable annular flange 75 extending from the lower end of the cylinder 72 to lie in close proximity to the inner surface of the cylindrical guide 71.

'One end of a water supply tube 76 communicating with the enclosed clearance 73 is mounted on the fixed annular flange 74. Water is supplied into said clearance 73 by a water supply pump 77 through said water supply tube 76. As shown in FIG. 21, by using an air compressor '78 and an air supplytube 79, the cylinder 72 is lifted as previously described. If the water supply tube 76 has been removed from the water supply pump 77 to leave the free end of the tube open, or if a threeway changeover valve or the like is placed in the water supply system to allow the water in the clearance 73 to flow back, then the water in the clearance 73 will be forced to flow back for drainage through the water supply tube 76 as the cylinder 72 moves upwardly.

After completion of the upward movement of the cylinder 72, parts (not shown) which have already been received in the cylindrical body 72 are utilized to form an extension cylinder, which is connected to the lower end of the cylinder 72 now in its temporarily fixed position. The annular flange 75 is removed and secured to the lower end of the newly connected extension cylinder to form an enclosed clearance having the same size as the previous clearance had before being decreased in size. The new clearance is then charged with water through the water supply tube 76.

. With liquid sealing means, it is possible for a layer of water to prevent the compressed air supplied into the inside space from leaking to the outside from between the cylindrical guide and the movable cylinder fitted thereto. Of course, the liquid sealing method is not limited in application to the first embodiment, but it may also be applied to the second embodiment.

Alternately, to achieve sufficient degree air-tightness when lifting the cylindrical body, the water in the clearance 73 can be pressurized by a pump and then allowed to flow out into the cylindrical guide.

SECOND EXAMPLE This method is more convenient than the first example described above.

As shown in F 1G. 22 an inflatable cylindrical sleeve or bellows 82 is connected to the lower end of a closed upper end cylinder 81 internally fitted to a fixed cylindrical guide 80. Thus, the inside space 83 of said cylinder 81 is sealed. An air supply tube 85 from an air compressor 84 communicates with said inside space 83 at a position near the bottom of the bellows 82. Supplying compressed air into the inside space 83 through the air supplytube 85 will cause the cylindrical body 81 to be lifted while expanding the bellows 82. The bellows 82 is of such length that no excessive tensile stresses will be exerted thereon when the cylinder moves upwardly to the upper limit. Thereafter the cylinder 81 is temporarily fixed, the bellows 82 is separated from the cylinder 81, an extension cylinder is connected to said cylinder 81 and the bellows 82 is connected to the lower end of the extension cylinder. The same procedures are repeated to construct the cylindrical structure.

If this sealing method is employed, the trouble of fixing the bellows must be taken, but there is the merit that the inside space of a cylindrical body can be made perfectly air-tight.

. THIRD EXAMPLE This sealing means is shown in FIG. 24, wherein a movable cylinder 91, i.e., a closed upper end cylinder or an extension cylinder, are internally fitted into a fixed cylindrical guide 90. Since the lower end periphery 92 of the movable cylinder 91 is positioned inside, a flexible annular seal 93 may be removably attached to the periphery 92 by means of a holder plate 94 and fasteners 95. The free peripheral portion 96 of the flexible annular seal 93 is in sealing contact with the inner surface 97 of said cylindrical guide 90.

If compressed air is supplied into the inside space of the movable cylinder 91, the movable cylinder 91 is raised. Since the free end portion 96 of the seal is pressed against the inner surface 97 of the cylindrical guide by the compressed air pressure p as the cylinder 91 moves upwardly, leakage of the compressed air at the clearance 99 between the cylindrical bodies 90 and 91 is reliably prevented by said seal 93.

When an extension cylinder is to be connected to the movable cylinder, the holder plate 94 and the seal 93 are removed, and the seal 93 and holder plate 94 are then fixed around the lower end periphery of the extension cylinder in the same manner as described above.

In contrast to the above example, if the movable cylinder body 91 is externally fitted to the fixed guide 90, the seal is attached to the upper end periphery of the cylindrical guide with the free peripheral portion thereof in sealing contact with the inner surface of the movable cylinder and with the free end of said seal directed in the direction of upward movement of the movable cylinder. The same sealing effect is obtained and, conveniently, there is no need to disconnect the seal as the structure is constructed.

lclaim:

1. A method of constructing a cylindrical structure such as a steel chimney comprising the steps of:

telescopingly fitting a vertically movable cylinder having a closed upper end to a fixed guide,

supplying compressed gas into a gastight inside space enclosed by said cylinder and guide thereby lifting said cylinder,

connecting to the lower end of said cylinder to an extension cylinder of substantially like diameter,

supplying compressed gas into the extended gas tight assembling at least some of said arcurate segments to provide said extension cylinder subsequent to each of said lifting steps.

3. A method of constructing a cylindrical structure as set forth in claim 2 further including the step of connecting the fixed guide as the final extension cylinder.

4. A method of constructing a cylindrical structure as set forth in claim 1 further including the steps of:

fitting said closed upper end cylinder externally over said fixed guide, and,

assembling cylindrical segments around said fixed guide subsequent to said initial lifting step to provide said extension cylinder.

5. A method of constructing a cylindrical structure as set forth in claim 1 further including the steps of:

providing a supporting steel tower incorporating a guide for said closed upper end cylinder, and progressively increasing the height of said steel tower to define the axial movement of said cylindrical structure as the height thereof is increased.

6. A method of constructing a cylindrical structure as set forth in claim 5 further including the step of temporarily vertically supporting the lifted cylinder with means on said steel tower during the step of connecting the next extension cylinder.

7. A method of constructing a cylindrical structure as set forth in claim 1 further including the steps of:

providing a crane mounted on the closed upper end cylinder whereby said crane is progressively raised as said cylinder is raised, and,

employing said crane in the construction of a structure adjacent to said cylindrical structure.

8. A method of constructing a cylindrical structure as set forth in claim 1 further including the step of opening the upper end of the closed upper end cylinder subsequent to obtaining the desired structural height. 

1. A method of constructing a cylindrical structure such as a steel chimney comprising the steps of: telescopingly fitting a vertically movable cylinder having a closed upper end to a fixed guide, supplying compressed gas into a gas tight inside space enclosed by said cylinder and guide thereby lifting said cylinder, connecting to the lower end of said cylinder to an extension cylinder of substantially like diameter, supplying compressed gas into the extended gas tight inside space thereby lifting said extension cylinder along with said closed upper end cylinder, and repeating the procedure with respect to the extension cylinder with subsequent extension cylinders until the desired structure height is obtained.
 2. A method of constructing a cylindrical structure as set forth in claim 1 further including the steps of: placing arcurate segments of extension cylinders within said closed upper end cylinder, fitting said fixed guide externally around said closed upper end cylinder, and, assembling at least some of said arcurate segments to provide said extension cylinder subsequent to each of said lifting steps.
 3. A method of constructing a cylindrical structure as set forth in claim 2 further including the step of connecting the fixed guide as the final extension cylinder.
 4. A method of constructing a cylindrical structure as set forth in claim 1 further including the steps of: fitting said closed upper end cylinder externally over said fixed guide, and, assembling cylindrical segments around said fixed guide subsequent to said initial lifting step to provide said extension cylinder.
 5. A method of constructing a cylindrical structure as set forth in claim 1 further including the steps of: providing a supporting steel tower incorporating a guide for said closed upper end cylinder, and progressively increasing the height of said steel tower to define the axial movement of said cylindrical structure as the height thereof is increased.
 6. A method of constructing a cylindrical structure as set forth in claim 5 further including the step of temporarily vertically supporting the lifted cylinder with means on said stEel tower during the step of connecting the next extension cylinder.
 7. A method of constructing a cylindrical structure as set forth in claim 1 further including the steps of: providing a crane mounted on the closed upper end cylinder whereby said crane is progressively raised as said cylinder is raised, and, employing said crane in the construction of a structure adjacent to said cylindrical structure.
 8. A method of constructing a cylindrical structure as set forth in claim 1 further including the step of opening the upper end of the closed upper end cylinder subsequent to obtaining the desired structural height. 